Device for heat treatment of wound ribbon magnetic cores



A ril 21 1970 G F.buB ov|N ETAL 3,507,967

DEVICE FOR HEAT TREATMENTDF WOUND RIBBON MAGNETIC CORES Filed July 5. 1968 s Sheets-Sheet 1- 3,507,967 DEVICE FOR HEAT TREATMENT OF wouun RIBBON MAGNETIC corms Filed July 5. 1968 April 21, 1970 G. F. DUBROVIN ETAL 3 Sheets-Sheet 2 I ll April 21, 970 F. DUBROVIN ETAL 3,507,967

DEVIGEFOR HEAT TREATMENT OF woum: RIBBON MAGNETIC CORES Filedv July 5. 1968 T 3 Sheets-Sheet a United States Patent 3,507,967 DEVICE FOR HEAT TREATMENT OF WOUND RIBBON MAGNETIC CORES Genrikh Fedorovich Dubrovin, Ulitsa Oktyabrskaya 36,

and Vladimir Valerievich Voronov, Ulitsa Lermontova 10, kv. 19, both of Novgorod, U.S.S.R.

Filed July 3, 1968, Ser. No. 742,415 Int. Cl. F27b 9/06 US. Cl. 13--1 2 Claims ABSTRACT OF THE DISCLOSURE A device is provided with for heat treatment of wound ribbon magnetic cores. The device has a tunnel furnace with a duct having guides for the guided passage of a row of abutting cores, the cores being fed one by one by a push rod into row from an inclined storage device at the inlet of the furnace while concurrently the row is advanced and at the outlet of the furnace the endmost core is removed in synchronism with the feed.

The present invention relates to electric furnaces for heat treatment of mass-produced semi-finished components for electrical and radio apparatus, and more particularly to tunnelfurnaces for heat treatment of wound ribbon magnetic cores.

Known in the art are tunnel furnaces into the chambers of which the magnetic cores to be treated are placed. each of said magnetic cores being piecewise fixed by a clamp. Such devices fail to provide for high-quality heat treatment of large lots of magnetic cores in compliance with stipulated specifications for heat treatment of manufactured products.

According to the above mentioned considerations, an object of the present invention is to eliminate the above mentioned disadvantages and to develop such a device which will permit heat treatment of a continuous flow of magnetic cores which are to be produced, for example, on a transfer line.

With this and other objects in view, a primary object of the present invention is to provide a device for heat treatment of wound ribbon magnetic cores together with a-system ensuring uniform and uninterrupted passage of components through the zone of heat treatment.

Said object is accomplished by the fact that in the device, according to the invention, the furnace duct is provided with guides mounted therein to direct the longitudinal movement of a series of annular magnetic cores with calibrated templets inserted therein, the furnace inlet being provided with an inclined storage means fitted with a push-rod which periodically pushes the extreme magnetic core from the storage means into the furnace and simultaneously presses the stack of magnetic cores against the stop of a discharge mechanism located at the furnace outlet and actuated synchronously with the push-rod of the storage means.

It is advantageous that the stop of the discharge mechanism be tapered and provided with spring-loaded pins entering the slot of a movable wedge which interacts with the stop in such a manner that when the wedge is shifted the pin springs press the stop away from the stack of magnetic cores thereby enabling the push-rod connected with the wedge to discharge the extreme magnetic core.

The advantages of such a solution lie in the fact that a continuous and uniform large-scale heat treatment of magnetic cores can be accomplished by a comparatively simple means; the magnetic cores are fed to the inclined storage means by gravity and further charging of each successive magnetic core brings about a discharge of the extreme already heat-treated magnetic core.

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The invention will be described hereinbelow by way of an exemplary embodiment with due reference to the ac companying drawings, wherein:

FIG. 1 shows the device for heat treatment of magnetic cores, according to the invention, in side view and partly in section;

FIG. 2 shows the device in FIG. 1, in top view;

FIG. 3 is a perspective in view in section of the furnace of the device of FIGS. 1 and 2;

FIG. 4 a side view partly in section of the discharge mechanism of the device of FIGS. 1 to 3; and

FIG. 5 shows the mechanism of FIG. 4, in top view and partly in section.

The device for heat treatment of wound magnetic cores, according to the invention, comprises a furnace 1 (FIGS. 1 to 3) of the tunnel type, at the inlet to duct 2 of which an inclined storage means 3 (FIG. 2) is mounted said storage means carrying a stack of magnetic cores 4.

The storage means 3 is fitted with a pneumatic push-rod 5 which periodically shifts the cores one by one to the discharge mechanism 6 while simultaneously pressing the stack of magnetic cores.

To guide the longitudinal movement of the magnetic cores 4, the duct of the furnace 1 is provided with longitudinal guides 7 (FIG. 3) fixed onto cross serips 8, When moving along the guides 7 the magnetic cores 4 are oriented by their calibrated templets vertically and surrounded by heating elements 10 of the furnace.

The discharge mechanisem 6 is provided with a wedgeshaped stop 11 (FIGS. 4, 5) at the end of which, adjoining the stack of magnetic cores 4, are fixed springloaded pins 12. Said pins enter a slot of the lower movable wedge 13 joined with a push-rod 14 and a slide 15. The slide 15 is actuated from a pneumatic cylinder 17 by means of a lever 16. In this case the wedge 13 moving with respect to the wedge-shaped stop 11 allows the latter to move away from the magnetic cores under the action of springs 18 on the pins 12. In this position, the pushrod 14 freely moves the extreme heat-treated magnetic core into the outlet duct 19 of the discharge mechanism.

The push-rod 5 of the storage means acts in synchronism with. the push-rod 14 of the discharge mechanism so that when a finished magnetic core is discharged, the next core is fed into. the duct 2 of the furnace.

What we claim is:

1. A device for heat treatment of wound ribbon magnetic cores, said device comprising: a tunnel furnace with a duct for passage of cores, said duct having an inlet and an outlet for the cores, heater means surrounding the duct in said furnace, guides mounted in said duct to insure longitudinal movement through said duct of a series of said cores pressed against each other, an inclined storage means operatively mounted at the inlet of said duct including a push rod periodically operable to feed the lowermost magnetic core from said storage means into the furnace and at the same time to press against the series of magnetic cores, and a discharge mechanism operatively mounted at the outlet of said duct actuated synchronously with the push rod of the storage means to remove a core each time one is added to the series, said discharge mechanism including a stop for said series of cores, said push rod pressing said series of cores against said stop.

2. A device as claimed in claim 1, wherein said stop comprises first and second wedge shaped members slidably engaged along respective inclined surfaces thereof, one of said members having a slot, and spring loaded pins passing through said slot and engaging the other of the members along the inclined surface thereof, the other surface of said other member being in contact with the first core in said series, said discharge mechanism including a push rod for removing said first core of the series, and means connected to said one member to slide the same and permit said other member to displace by the resilience of the springs.

References Cited UNITED STATES PATENTS 2,491,687 12/1949 Nutt 219388 X 3,119,354 1/1964 Gawlitz et a1. 219388 X BERNARD A. GILHEANY, Primary Examiner 5 H. B. GILSON, Assistant Examiner US. 01. X.R 

